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The P-Charge Info Header in the SIP URI indicates the number which will be billed for a particular call. The P-Charge Info header is much like the Charge Number parameter in ISUP. The IMG 2020 supports interworking the P-Charge Info Header from both SIP to SS7/ISUP and the SIP INVITE message on incoming leg to SIP INVITE message on outgoing leg. Once the P-Charge Header has been inter-worked to the SS7/ISUP leg, it can be used to generate or interact with other entities to create billing records. See below for more information.
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